The line is drawn on the fixing of items. Even a cable cleat can be considered as fixing. So if you run the cable in through the cat flap and plug in that's may be OK. But drill a hole and remove and re-fit the plug to thread cable through hole and it's fixed so needs notifying under Part P.
As to dimming the whole idea of a quartz halogen lamp is to maintain the envelope at a high temperature so the tungsten will not re-deposit itself on the quartz envelope. The idea of extra low voltage helps by having a thicker element and the inverter (often called a transformer) maintains the voltage to much finer limits than with low voltage version. They are not as a result really suitable lamps for dimming. Although some inverters can be controlled by a dedicated dimming unit this reduces the lamp life. But even if your not worried about lamp life the inverter and dimmer need to be matched.
[quote If this is a plug in transformer, how do you plan to put a dimmer in-between the transformer and the supply?
It's not a plug in transformer per se.... it's a transformer with a flying lead and a 3 pin plug..... with an output to the ELV lights.
But anyway......I'll just experiment with lower wattage bulbs as suggested (as long as Ban all Sheds doesn't lie awake all night worrying about an amatuer changing bulbs !!)
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local